I acquired an Aux Master module over Ebay and planned to use it as a Bus-Amp. (And as a Line-Driver for a Compressor)

Can anyone tell me, what value the coupling resistors (?) to the Aux-Rails from the Aux-Sends are?What level does the Module expect at the Inputs? (Is the Bus technology VOLT or CURRENT based?)...I'll look up the Module number, if that will help.